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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * ALSA sequencer Queue handling4 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>5 */6#ifndef __SND_SEQ_QUEUE_H7#define __SND_SEQ_QUEUE_H8 9#include "seq_memory.h"10#include "seq_prioq.h"11#include "seq_timer.h"12#include "seq_lock.h"13#include <linux/interrupt.h>14#include <linux/list.h>15#include <linux/bitops.h>16 17#define SEQ_QUEUE_NO_OWNER (-1)18 19struct snd_seq_queue {20 int queue; /* queue number */21 22 char name[64]; /* name of this queue */23 24 struct snd_seq_prioq *tickq; /* midi tick event queue */25 struct snd_seq_prioq *timeq; /* real-time event queue */ 26 27 struct snd_seq_timer *timer; /* time keeper for this queue */28 int owner; /* client that 'owns' the timer */29 bool locked; /* timer is only accesibble by owner if set */30 bool klocked; /* kernel lock (after START) */31 bool check_again; /* concurrent access happened during check */32 bool check_blocked; /* queue being checked */33 34 unsigned int flags; /* status flags */35 unsigned int info_flags; /* info for sync */36 37 spinlock_t owner_lock;38 spinlock_t check_lock;39 40 /* clients which uses this queue (bitmap) */41 DECLARE_BITMAP(clients_bitmap, SNDRV_SEQ_MAX_CLIENTS);42 unsigned int clients; /* users of this queue */43 struct mutex timer_mutex;44 45 snd_use_lock_t use_lock;46};47 48 49/* get the number of current queues */50int snd_seq_queue_get_cur_queues(void);51 52/* delete queues */ 53void snd_seq_queues_delete(void);54 55 56/* create new queue (constructor) */57struct snd_seq_queue *snd_seq_queue_alloc(int client, int locked, unsigned int flags);58 59/* delete queue (destructor) */60int snd_seq_queue_delete(int client, int queueid);61 62/* final stage */63void snd_seq_queue_client_leave(int client);64 65/* enqueue a event received from one the clients */66int snd_seq_enqueue_event(struct snd_seq_event_cell *cell, int atomic, int hop);67 68/* Remove events */69void snd_seq_queue_client_leave_cells(int client);70void snd_seq_queue_remove_cells(int client, struct snd_seq_remove_events *info);71 72/* return pointer to queue structure for specified id */73struct snd_seq_queue *queueptr(int queueid);74/* unlock */75#define queuefree(q) snd_use_lock_free(&(q)->use_lock)76 77/* return the (first) queue matching with the specified name */78struct snd_seq_queue *snd_seq_queue_find_name(char *name);79 80/* check single queue and dispatch events */81void snd_seq_check_queue(struct snd_seq_queue *q, int atomic, int hop);82 83/* access to queue's parameters */84int snd_seq_queue_check_access(int queueid, int client);85int snd_seq_queue_timer_set_tempo(int queueid, int client, struct snd_seq_queue_tempo *info);86int snd_seq_queue_set_owner(int queueid, int client, int locked);87int snd_seq_queue_timer_open(int queueid);88int snd_seq_queue_timer_close(int queueid);89int snd_seq_queue_use(int queueid, int client, int use);90int snd_seq_queue_is_used(int queueid, int client);91 92int snd_seq_control_queue(struct snd_seq_event *ev, int atomic, int hop);93 94#endif95